International occupational health.
D004467:Economics; D004739:England; D005060:Europe; D006666:History of Medicine; D006801:Humans; D007390:International Agencies / Q000266:history*; D007391:International Cooperation; D007564:Japan; D007750:Labor Unions; D009678:Nuclear Energy; D009787:Occupational Medicine / Q000266:history*; D011637:Public Health Nursing; D012106:Research; D012943:Social Security; D014481:United States; D014944:World Health Organization